An article on the CASAA study which has been funded through donations by many of us here on ECF. I particularly like the third paragraph in the article:
CASAA: New study confirms that chemicals in electronic cigarettes pose minimal health risk - MarketWatch
By reviewing over 9,000 observations about the chemistry of the vapor and the liquid in e-cigarettes, Dr. Burstyn was able to determine that the levels of contaminants e-cigarette users are exposed to are insignificant, far below levels that would pose any health risk. Additionally, there is no health risk to bystanders. Proposals to ban e-cigarettes in places where smoking is banned have been based on concern there is a potential risk to bystanders, but the study shows there is no concern.
CASAA: New study confirms that chemicals in electronic cigarettes pose minimal health risk - MarketWatch